Figure 7 LEFT. Photograph of the outcrop as it is exposed along West Cove Road. Note the massive nine-foot thick sandstone layer which caps the site and provides the last occurrence of sandstone sole casts of trace fossils. We counted over 40 layers of sandstone which extended across the 300 feet of the outcrop. Each sandstone layer exhibits some degree of sole casts (bottom) and ripple marks (top). Scale is six-inch units. Note the "thickening upward" nature of the sandstone units. This is indicative of a nearing sand source in a turbidity current setting (see Walker, 1992, pp. 245-247).

Figure 8 RIGHT. Photograph of the outcrop showing the thin sandstone layers. If bioturbation of the sandstone did occur as Sheehan (1988) has suggested, then the sandstones should have been obliterated by bioturbation, especially the thin layers. However, if the sands were deposited in turbidity currents with the clays serving as the trace maker substrate, then the sandstones would serve as sole casts and would reflect the bioturbated nature of the clays. With eventual sedimentary loading and tectonic input, the clays would be compressed into the shale layers seen today, and all that would remain as evidence for trace maker activity would be preserved as sole casts along the bottoms of the sandstone layers. The sandstone trace maker cast is what is found along the bottom of even the thinnest sandstone layers.